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post #1 of (permalink) Old 05-27-2007, 08:25 PM Thread Starter
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Crown Automotive CJ OEM Tach Replacement

I just got a Crown Automotive CJ OEM Tach Replacement part #5459418 off E-bay. My 85 CJ did not come with one, so in keeping with OEM style I went with this one. Hook up instructions appear pretty straight forward. However, I need to cut a hole in my dash to install. (1) Does anybody know if drilling a 2.75" hole is the correct size for mounting this tach? (2) I have a 94 YJ 4.0L in my CJ, I am assuming I put the cylinder selecter switch to 6 cylinder or am I missing something? (3) I have a white wire coming out of the tach that connects to the CJ dash illumination wiring. What/which wire in the CJ dash do I connect this wire to for tach illumination? Thanks Guys for your help.
---Duane

1985 CJ with a transplanted 94YJ 4.0L motor, T176 tranny, mainly stock otherwise. ><>
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post #2 of (permalink) Old 05-27-2007, 08:36 PM
 
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Connect that white wire (for dash Illumination) to speedometer bulb wire. They have three bulbs that light up the speedometer. I would just tap into one of those by splicing it. Hope it helps. It should tell you the correct size to drill for the dash if not take a tape measure and check the circumference of it just make sure you leave the "lip" of it to it wont slide all the way through.
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post #3 of (permalink) Old 05-27-2007, 09:31 PM
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I think 2 7/8” is a standard gauge size. Cut the hole in a piece of wood and check. I think you’ll have to ream it out.

You should have an easy place to get a feed for the light. Depending on which side you mount it on, splice into the feed for the light above the wiper or headlight switch.

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post #4 of (permalink) Old 05-27-2007, 10:33 PM
 
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Quote:
Originally Posted by DuaneD View Post
I have a 94 YJ 4.0L in my CJ, I am assuming I put the cylinder selecter switch to 6 cylinder or am I missing something?
That's where it needs to be.
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post #5 of (permalink) Old 05-27-2007, 10:49 PM
 
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Yah definitely a good check. I didn't want to say its standard because I only know the smaller gauges are 2 1/16. IE voltmeter and oil gauge. always fancied my tach to be up closer to eye level when I drive, but I've kinda got that racing spirit if you will.
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post #6 of (permalink) Old 05-27-2007, 11:22 PM Thread Starter
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Thanks guys.

1985 CJ with a transplanted 94YJ 4.0L motor, T176 tranny, mainly stock otherwise. ><>
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post #7 of (permalink) Old 05-27-2007, 11:25 PM
 
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85 cj is what I have. I got a painless wiring harness and took care of EVERYTHING. Just a thought if your havign aton of trouble with that cj harness.
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post #8 of (permalink) Old 05-29-2007, 12:21 AM
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If memory serves, the lighting wires are orange. Does this tach hook up on the positive side of the coil like a stock tach or on the negative side like "normal" tachs?

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post #9 of (permalink) Old 05-29-2007, 11:10 PM
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Quote:
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If memory serves, the lighting wires are orange. Does this tach hook up on the positive side of the coil like a stock tach or on the negative side like "normal" tachs?
I would trust your memory over mine Will.

CJ dash lights (1982 to 1986) are all of those orange wires, connect into one of them for the light.

Aftermarket tach's connect to the negative side of the coil. The ignition was powered through the stock CJ tach.


Dale

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post #10 of (permalink) Old 05-30-2007, 10:29 AM
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Originally Posted by OlllllllOCJ View Post
CJ dash lights (1982 to 1986) are all of those orange wires, ...
You can add 1980 to that which probably means ’81 also.

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